EPJ

2021 Impact factor 3.131
EPJ A - Hadrons and Nuclei
Hadrons and Nuclei
Eur. Phys. J. A 15, 295-298 (2002)
DOI: 10.1140/epja/i2002-10054-4

Short Note

Asymmetry measurement of the polarized $\mth{\Sigma^{+}p}$ elastic scattering and the hyperon-nucleon spin-orbit interaction

T. Kadowaki1, J. Asai1, W. Imoto1, S. Iwata1, M. Kurosawa1, K. Nakai1, A. Sato2, K. Imai3, H. Takahashi3, C.J. Yoon3, T. Maruta4, M. Ieiri5, T. Nagae5, H. Noumi5, T. Fukuda6, P.K. Saha6 and B. Bassalleck7

1  Department of Physics, Tokyo University of Science, Noda, Chiba, Japan
2  Department of Physics, Osaka University, Toyonaka, Osaka, Japan
3  Department of Physics, Kyoto University, Kyoto, Japan
4  Department of Physics, University of Tokyo, Tokyo, Japan
5  High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki, Japan
6  Laboratory of Physics, Osaka Electro-Communication University, Osaka, Japan
7  Department of Physics, University of New Mexico, Albquerque, NM, USA

nakai@post.kek.jp

(Received: 27 May 2002 / Published online: 19 November 2002)

Abstract
In order to study the hyperon-nucleon spin-orbit interaction, asymmetries of the polarized $\Sigma^{+}$ elastic scattering on protons have been measured. The polarized hyperons were produced through the p( $\pi^{+}$, K +) $\Sigma^{+}$ reaction in a liquid-scintillator active target, and tracks of $\Sigma^{+}$p scattering events were recorded with a newly developed track detector named SCITIC (scintillating track image camera). Although analyses of 10 times more data with more sophisticated data-taking systems and more elaborated analyzing tools are under way, data from an early stage of this experiment indicate a large $\Sigma^{+}$p spin-orbit interaction in contrast to the case of the small $\Lambda$N spin-orbit interaction.

PACS
13.75.Ev - Hyperon-nucleon interactions.
25.80.Pw - Hyperon-induced reactions.

© Società Italiana di Fisica, Springer-Verlag 2002

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